Optimisation of offshore wind floater from dynamic cable ...
Floater and Riser Concept Selection FINAL - energydelphos.com · occur such as heat stress or heat...
Transcript of Floater and Riser Concept Selection FINAL - energydelphos.com · occur such as heat stress or heat...
Confidential © 2013 Aker Solutions Preferred partner
Preferred partner
Floater and Riser Concept SelectionINTSOK – Ciudad del Carmen, 8th-10th May 2013Peter Leitch | Study Manager
Confidential © 2013 Aker Solutions Preferred partner09 May 2013 Safety MomentSlide 2
Heat & HealthWhen the body is unable to cool itself by sweating, several heat-induced illnesses can occur such as heat stress or heat exhaustion and the more severe, heat stroke which can result in death.
Factors Leading to Heat StressHigh temperature and humidity; direct sun or heat; limited air movement; physical exertion; and poor physical condition.
Symptoms of Heat Exhaustion• Headaches, dizziness, lightheadedness or fainting.• Weakness and moist skin.• Mood changes such as irritability or confusion.• Upset stomach or vomiting.
Symptoms of Heat Stroke• Dry, hot skin with no sweating.• Mental confusion or losing consciousness.• Seizures or convulsions.
Preventing Heat Stress• Know signs/symptoms of heat-related illnesses; monitor yourself and coworkers.• Block out direct sun or other heat sources.• Use cooling fans/air-conditioning; rest regularly.• Drink lots of water; about 1 cup every 15 minutes.• Wear lightweight, light colored, loose-fitting clothes.• Avoid alcohol, caffeinated drinks, or heavy meals.
What to Do for Heat Related Illness• Call 911 (or local emergency) at once.While waiting for help to arrive:• Move the worker to a cool, shaded area.• Loosen or remove heavy clothing.• Provide cool drinking water.• Fan and mist the person with water.
Confidential © 2013 Aker Solutions Preferred partnerSlide 3
What We Do - Business Areas
Maintenance, modifications and operations
Oilfield services and marine assets
Umbilicals Process systemsEngineering SubseaDrilling technologies
Mooring and loading systems
Well intervention services
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Front End SpectrumRegion North America
(Houston)
Font End & TechnologyHenning Østvig
Senior Vice PresidentOslo
GM- St. John’sBjorn Viken
VP Engineering –St. John’s
Richard Severs
Executive AssistantKarina Uno
Technology Umbilicals/Risers
Kevin Haverty
Hull/Marine Engineering
Rolf Eide
Facilities/Process EngineeringBenny Farid
Director of Projects/Construction
Vladi Gorescu
Tendering/MarketingTorbjorn Prestegard
VPHouston
Business Management
William Rodrigues
Projects & Systems Support
Lars Marthinsen
FEED/DetailedEng ProjectsJon Husby
Front End SpectrumBarbara Thompson
Senior Vice President
Subsea Systems Engineering
TBN
Manager of Projects
Peter Leitch
Confidential © 2013 Aker Solutions Preferred partnerSlide 5
Major Components of Floating Production Systems
Subsea Systems
Risers & Umbilicals
Topsides
Hull
Station-keeping
(Mooring)
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Experience in Floating Facilities
1972 19911989 19961995 1997
2000 20052001 20082007 2010 2012
32 H3Semis
Veslefrikk Snorre TLP Norne FPSOGenesisSpar
Heidrun TLP
Asgard B Snorre B Kristin, White Rose
Blind Faith
2 x Aker H6e Gjøa Ichthys
Semi &FPSO
Laminaria
1999
More than 50 floating facilities designed
SkarvFPSO
2011
Confidential © 2013 Aker Solutions Preferred partnerAugust 28, 2010 Slide 7 part of Aker
Jacket / Dry tree
CompliantTower / Dry tree TLP / Wet & Dry tree
Mini-TLP / Dry & wet tree
Semi / Wet (Dry) tree
Truss Spar / Wet & Dry tree
Spar / Wet & Dry tree FPSO / Wet tree
Confidential © 2013 Aker Solutions Preferred partner09/05/2013 Slide 8
Deepwater Floater Options
Storage or pipeline
Dry trees or wet trees
Direct well access or independent drillingFPSO
TLP / Spar Semi w. drill
Semi / mini TLPMild weatherNo turret
Severe weatherTurret
Aasgard A
Snorre A Genesis
Snorre BP-51
Confidential © 2013 Aker Solutions Preferred partnerto edit this text Floaters & Risers-2008Slide 9
■ Surface (Dry Trees)■ Riser type: Top Tensioned Riser (TTR)■ Harsh environment: Low heave motion floaters,
i.e. TLPs, Spar, Fixed platforms■ Benign environment: Also possible with Semi■ GOM: Dry Tree Semi – new concept
■ Subsea (Wet Trees)■ Riser type: Flexibles, metallic catenaries, Hybrid
risers, etc.■ All floater types (FPSO, TLP, Spar, Semi)
Production - Surface vs. Subsea Completion
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Ship-shaped FPSOs
■ Storage required - No local infrastructure available
■ Disconnectable turret, able to quickly evade hurricanes
■ Not sensitive to topsides weight or area restrictions
■ Larger motions –challenges for risers
■ Faster track schedule potential for conversion-based FPSOs
9 May, 2013Slide 10
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TLPs
■ Very low heave motions for excellent dry tree applications
■ Water-depth limited (<1500m) due to tendon
■ Some examples may require offshore integration
■ Sensitive to topsides weight increase
9 May, 2013Slide 11
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Spars
■ Offshore integration required
■ Topsides weight and footprint challenges
■ Smaller topsides to hull weight ratios
■ Reduced heave motions suitable for wet or dry tree applications
■ Storage possible with new belly spar concept
9 May, 2013Slide 12
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Semisubmersibles
■ Inshore hull-deck integration
■ Large deck footprint available
■ Favourable hull/deck weight ratio
■ Large number of risers can be accommodated
■ Deep draft semis can accommodate SCRs in wet tree configuration
■ Dry tree semi can accommodate TTRs for direct well access
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Confidential © 2013 Aker Solutions Preferred partner9-May-13Slide 14
Deepwater Floater Concept Comparison
As-built data, steel weight vs. deck load
Floater Weight Efficiency
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
50,000
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000
Hull Weight (st)
Deck
Ope
ratin
g W
t (st
)
TLPSPARSemi
Semi
TLP
Spar
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Riser Categories
9 May, 2013Slide 15
Flexible Risers
TTR - Marine Drilling Riser Hybrid Riser + SCR
Top Tension Riser + SCR
DNV – Riser definitions(DNV-OS-F201)
■ Top Tension Risers■ Marine Drilling (LP)■ HP Drilling■ Production
■ Flexible Risers■ Import/Export
■ Steel Catenary Risers■ Import/Export
■ Hybrid Risers■ Import/Export
■ Lazy Wave■ Import/Export
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Top Tensioned Riser (TTR)
■ TLP, Spar, Semi (new concept)■ Tensioner, Buoyancy Can
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Production - Flexibles – Widely used but with limitations
0
500
1000
1500
2000
2500
3000
6" 8" 10" 12" 14" 16"Internal Diameter
m
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Steel Catenary Risers (SCRs)
■ Semi, TLP, Spar■ Diameter 4.5″ – 24 ″■ Titanium Stress
Joint, or Flexible Joint
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Confidential © 2013 Aker Solutions Preferred partnerSlide 19
24” Gas Export SCR Configuration (from a TLP)
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Hybrid Risers
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■ Typical deep water solution only■ Relative efficiency increases with water
depth■ Little effect on floater (separate buoyancy)
■ Important for selection of type of hybrid■ Options for flow assurance■ Effective installation
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Lazy Wave Riser (LWR)
• Conventional Draft Semi may potentially be utilized
•LWR effective in further reducing VIM fatigue damage
• Reduced fatigue damage in TDZ
• Potential to eliminate cladding in Sour Service conditions
Confidential © 2013 Aker Solutions Preferred partnerto edit this text Floaters & Risers-2008Slide 23
Production – Subsea Completion – Flexible/Compliant
Limits on combination of: ■ diameter ■ water depth ■ temperature
Diameter, D
Wat
er d
epth
, dSteel Catenaries
Titanium Catenaries
Flexibles
Confidential © 2013 Aker Solutions Preferred partnerto edit this textSlide 24
Risers – challenges (1)
■ Floater motions■ From wind & waves■ From current (oscillations; vortex induced motion)■ => dynamic motions of risers
■ Remedies:■ Flexibles in “shallow” water■ SCRs■ SCRs with tailored dynamics■ Titanium Catenary?■ Riser towers (bundles or single)
Confidential © 2013 Aker Solutions Preferred partnerto edit this textSlide 25
Risers – challenges (2)
■ Requirement for disconnect?■ Quick disconnect only reasonable■ FPSO with turret: proven!■ Others solutions: on concept level
16 0 m43 m
Confidential © 2013 Aker Solutions Preferred partnerto edit this textSlide 26
Risers – challenges (3)
■ Insulation of riser■ Increases complexity of riser system
■ Remedies:■ Externally insulated –> gets light■ Pipe-in-pipe -> gets heavy
■ Sour service:■ Welding & material challenge■ Reduces fatigue capacity considerable
■ Remedy: ■ Need less dynamic exposure of riser
Pipe-in-pipe?
Confidential © 2013 Aker Solutions Preferred partnerto edit this textSlide 27
Risers – challenges (4)
■ Installation
■ Weight in deep waters -> few vessels / high cost, for ■ Large diameter (exports)■ Pipe-in-pipe
■ In field welding quality for dynamic risers
■ Sensitive to bending/contact pressure during S-lay■ Externally Insulated Risers (SCRs) – syntactic foam■ Application of strakes (for avoiding riser VIV)
Confidential © 2013 Aker Solutions Preferred partnerSlide 28
Building Blocks for Concept Screening Methodology
Subsea Systems
Risers & Umbilicals
Topsides
Hull
Station-keeping
(Mooring)
Confidential © 2013 Aker Solutions Preferred partnerSlide 29
Field Options Generator Methodology
Approximately150 Cases, 7 Families
Identified
Transfer System Production Facility Station Keeping Oil Storage/Offloading Gas Export SystemTransfer System Production Facility Station Keeping Oil Storage/Offloading Gas Export System
Tool Box Tool Box Tool Box Tool Box Tool BoxA SCRs 1 FPSO - Ship Shape 1 Spread moored - Non turret a Shuttles Only (Tandem Offloading) SCRs
B Free Standing Hybrid Risers (SLORs) 2 Semisubmersible 2 DP b FSO & Shuttles (Tandem Offloading) Free Standing Hybrid Risers (SLORs)
C Bundled Hybrid Risers 3 FPSO - Non Ship Shape 3 CALM with soft connection Bundled Hybrid Risers
D TTRs 4 FPU - Ship Shape 4 SALM with soft connection TTRs
E Flexible Risers 5 Spar 5 Turret moored - disconnectable Flexible Risers
F Offset SCRs (OSCRs) 6 FPSO - Spar Shape 6 Turret moored - non-disconnectable Offset SCRs (OSCRs)
G SCRs with SSB 7 TLP 7 with Thruster Assist
16 Cases, 4 FamiliesShort-listed
Five “Building Blocks” identified
Toolbox Options for each “Building Block”
■ Seven (7) criteria for qualitative evaluation:● Mobility● Functionality● Adaptability● Technology● Cost● Schedule● Execution
■ Criteria scored 1 to 10 on an equally weighted qualitative basis
Options selectively chosen and combined
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45 Concepts:• FPSO• SEMI_D• TLP• SEMI• FPDSO• SEMO• Tie-back to
Heidrun
8 Concepts:• FPSO• SEMI_D• TLP• SEMI
2 Concepts:• FPSO• SEMI
1 Concept:• FPSO
SKARV - Concept Selection and Definition Process
Confidential © 2013 Aker Solutions Preferred partnerSlide 31
GOM Floaters – Water Depth vs. Topsides Weight
Confidential © 2013 Aker Solutions Preferred partner09/05/2013 Slide 32
Blind Faith
Aker Solutions Scope:- Hull & mooring EPC- Riser design- Installation
Client: Chevron - 2,000 m water depth- 9,000 Ton Topsides- 45mbopd, 45mmcfgpd - Steel Catenary Risers with
Titanium Stress Joints- Polyester mooring (8 lines)
Confidential © 2013 Aker Solutions Preferred partner09/05/2013 Slide 33
Steel Catenary Risers■ 7” and 14” SCRs■ Weight coating■ Strakes for VIV■ Titanium Stress Joints
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